Very scared help!? boyfriend in icu?

Okay so I recently asked this question but didn't really get a reply! My Fiance recently overdosed on xanax and in his sleep he threw up and aspirated it into his lungs and it gave him pneumonia and he layer like that all night until like 4am when I woke up and felt his chest to see if he was okay cuz when he went to bed that night, his heart was racing! And his heart was barely breathing and soaked in sweat and throw up!!! I flipped out and called 911 and well now he's in icu and at first he had high liver enzymes, kidney failure,not responsive at all, 0 respiration and they thought he had brain damage but now, 6 days later in icu...he's improved now somewhat ...his liver is getting better, his kidneys are a 100% better and functions great, he's very responsive and writing us perfect sentences, making motions for stuff but he can't talk cuz he's on the ventilator. They took him off the ventilator the other day for a few hours and he breathes on his own but because of the pneumonia on right lung and the newly developed staph infection, he is breathing too shallow and fast so they put him back on. I know I wrote alot but I am Sooooo scared im going to lose him. He's on a few different antibiotics but he keeps spiking fevers so im just wanting to hear some positive info about how he will get better! Is it common for someone that went through all of this to come out fine? He's young, only 28. Please no rude comments. Thanks so much